Lock



FIG. 1 is a perspective view of a lock showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is another perspective view of the lock shown with environment.

The broken line showing of a lock is for the purpose of illustrating portions of the article and forms no part of the claimed design. The broken line showing of environmental structure forms no part of the claimed design. 

CLAIM The ornamental design for a lock, as shown and described. 